@elliot Thanks for reply!
But dont work for me in multisite:/
I use
$galerias = get_field('gallery', $post->ID);
if( $galerias ):
foreach( $galerias as $galeria ):
$html .='<li style="text-align:center !important;">';
$html .='<a href="'.get_permalink($post->ID).'" rel="lightbox">
<img src="'.$galeria['sizes']['large'].'" alt="'.$img_alt.'" /></a>';
$html .='</li>';
endforeach;
endif;